If you could place the star Stephenson 2-18 (ST2-18, with a radius ≈ 2,150 R☉ [≈10.00 AU]) at the center of our solar system, its surface would extend out to about 10 AU, and would swallow the orbits of Mercury, Venus, Earth, Mars, Jupiter and Saturn (6 planets), leaving Uranus and Neptune (2 planets) outside.
That’s fkn BIG.